“There’s more irrigation in Canterbury than the whole rest of New Zealand put together to make this landscape into a dairy farming situation.”
use of synthetic nitrogen fertiliser
farming is polluting our rivers and aquifers,
Cows pee – a lot, and this nitrate-rich urine combines with synthetic fertilisers to dump a whole lot of nitrogen into the soil.
very quickly past the root zones through those gravelly soils and into the layers and layers of aquifers that run out this way,”
high nitrate levels in rivers and aquifers are unwelcome for several reasons. For our rivers and lakes, they cause toxic algal blooms which can be harmful to plant, marine and human life.